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Updated: Sep 23, 2025
Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
Crystal structures, and magnetic and thermal properties of basic copper formates with two-dimensional
1General Education, Faculty of Science and Technology, Seikei University 3-3-1 Kichijoji-kitamachi, Musashino-shi Tokyo 180-8633 Japan fujitaw@st.seikei.ac.jp +81-422-37-3781 +81-422-37-3792.
Abstract:
Basic copper formate, [Cu3(OH)4(HCOO)2], was selectively prepared by hydrolysis of formate ions in concentrated aqueous solutions of copper formate. This material exhibits a two-dimensional distorted triangular-lattice magnetic network of Cu(ii) ions where S = 1/2. The dominance of antiferromagnetic interactions with J/k B = 35.7(2) K and a magnetic anomaly at approximately 2.3 K that corresponds to a paramagnetic-to-antiferromagnetic ordering transition were revealed by magnetic measurements. The field dependence of the magnetisation at 2 K corresponds to the 1/3-magnetisation plateau that is commonly observed in a two-dimensional triangular-lattice system. Moreover, heat-capacity measurements found a λ-type anomaly at 2.15 K, which is the magnetic transition temperature. This material may be a good candidate for a geometrical frustration system with novel magnetic phenomena such as spin-liquid states.
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